Antenna for an Electronic Tag

• US 20090146819A1
• Filed: 04/18/2006
• Published: 06/11/2009
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: Stmicroelectronics France (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SA (STMicroelectronics NV)
• Inventors: Mani, Christophe
• Granted Patent: US 8,514,083 B2
• Time in Patent Office: Days
• US Class Current: 340/572.700
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07771 the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
• CPC Class Codes: Y10T 29/49155 Manufacturing circuit on or in base
• CPC Class Codes: Y10T 29/49165 by forming conductive walled aperture in base

Abstract

The invention concerns an inductive element for forming an electromagnetic transponder antenna, comprising a first group of mutually parallel conductors coplanar in a first plane, a second group of mutually parallel conductors coplanar in a second plane parallel to the first plane, and an insulating material separating the two groups of conductors, one end of each conductor of the first group being connected to one end of a conductor of the second group whereof the other end is connected to one end of another conductor of the first group, the connections between the conductors being conductive via holes in the thickness of the insulating material.

Claims

1. An inductive element, characterized in that it comprises:

a first group of parallel conductive tracks coplanar in a first plane;

a second group of parallel conductive tracks coplanar in a second plane parallel to the first plane; and

an insulating material separating the two groups of tracks, one end of each track of the first group being connected to an end of a track of the second group having its other end connected to an end of another track of the first group, the connections between tracks being conductive vias that cross the insulating material.

2. The inductive element of claim 1, wherein each group of tracks is deposited on one of the surfaces of an insulating support pierced with through metallized holes (v) forming said vias.

3. The inductive element of claim 2, wherein the insulator support is a printed circuit wafer.

4. The inductive element of claim 1, wherein each group of conductive tracks is formed in a metal level placed on a semiconductor wafer with an interposed insulating layer in which are formed said vias.

5. An antenna for receiving a radio-frequency transmission, characterized in that it comprises the inductive element of claim 1.

6. An electromagnetic transponder comprising the antenna of claim 5.

7. The transponder of claim 6, wherein electronic circuits of the transponder are formed in the semiconductor wafer underlying the antenna.

8. The electromagnetic transponder of claim 6, disposed on a metal surface of an object.

9. An object comprising at least one metal surface, comprising, against the at least one metal surface, the transponder of claim 6.